EP 0349262 B1 19940316 - Method for reducing drill string multiples in field signals.
Title (en)
Method for reducing drill string multiples in field signals.
Title (de)
Methode zur Reduktion von Bohrstangemultiplen in Feldsignale.
Title (fr)
Méthode de réduction des multiples de barre à forer dans les signaux de surface.
Publication
Application
Priority
US 21364088 A 19880630
Abstract (en)
[origin: US4862423A] The invention comprises a method of geophysical exploration wherein a signal is generated at the lower end of a drill string and propagates into the earth and up said drill string. The signal is detected at the top of said drill string and at other locations substantially at the earth's surface. The signal detected at the top of the drill string is utilized to develop an operator to reduce the magnitude of drill string multiples in the signal detected by the field sensors.
IPC 1-7
IPC 8 full level
G01V 1/42 (2006.01)
CPC (source: EP US)
G01V 1/42 (2013.01 - EP US); G01V 2210/161 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR GB IT NL
DOCDB simple family (publication)
US 4862423 A 19890829; AU 3491989 A 19900104; AU 612031 B2 19910627; BR 8903222 A 19900213; CA 1311466 C 19921215; DE 68913832 D1 19940421; DE 68913832 T2 19940901; DK 174301 B1 20021125; DK 323689 A 19891231; DK 323689 D0 19890629; EP 0349262 A2 19900103; EP 0349262 A3 19910925; EP 0349262 B1 19940316; MY 104045 A 19931030; NO 176983 B 19950320; NO 176983 C 19950628; NO 892164 D0 19890530; NO 892164 L 19900102; NZ 229303 A 19901221; OA 09051 A 19910331
DOCDB simple family (application)
US 21364088 A 19880630; AU 3491989 A 19890518; BR 8903222 A 19890629; CA 598870 A 19890505; DE 68913832 T 19890627; DK 323689 A 19890629; EP 89306506 A 19890627; MY PI19890885 A 19890629; NO 892164 A 19890530; NZ 22930389 A 19890526; OA 59603 A 19890630